In 2005 Keysight Technologies' facility at South Queensferry in the United Kingdom was the first calibration laboratory to be granted ISO/IEC 17025 accreditation for an internet-enabled technology to make measurements of complex reflection and transmission coefficient parameters.

The E6650A (EXF) does not have a calibration certificate because of its flexible TRX configuration. Only the M9300A Reference and M9440A TRX modules installed inside the E6650A chassis have a calibration certificate